The actor and director claimed his next appearance as the boxer - his most recognizable character - in Creed III will be his last.
The character is trainer to the film's star, boxer Adonis Creed, played by Michael B. Jordan, son of Rocky's old sparring partner Apollo Creed in the 80s run of Rocky movies.
In an exclusive interview, Stallone told RadarOnline: "They're ready to go onto Creed III. Then hopefully I'm gonna turn in my bucket and towel."
Stallone added he finds the way modern movies are made leaves him uninspired, and there is little room for maverick filmmakers anymore.
He added: "It's a whole different world to when I started out. There is no more inspiration. It's all very, very mathematical, presold.
"They wouldn't even make Rocky today, if they did it would be a little indie movie at best.
"I don't know if the audience today would be as receptive as it was back then."
Although he is planning to leave Rocky behind, Stallone is still really proud of his achievements with the movie series, which he turned his attention to after his last hit action franchise The Expendables.
He added: "There have been over 300 boxing films made and none of them have been successful. I said let's not do a boxing movie, it's a love story and he happens to be a great boxer, that's the story and it worked."
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Creed II is released on November 21.
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